Zoe Buxton is living with a rare condition. Picture: Instagram: @a_littlebitoflifeSource:Instagram

ZOE Buxton and her identical twin sister Lucy Fretwell suffer from a condition that affects only one in two million people.

It’s an illness that will essentially turn them to stone.

Known as Fibrodysplasia Ossificans Progressiva (FOP) — the condition causes muscle tissue, ligaments and tendons to be replaced by bone.

The rare medical condition impacts just 800 people around the world, with Lucy and Zoe just one of three sets of twins with the condition.

The twin women, who live in Ballymena, Northern Ireland, were born with the condition — but doctors failed to pick up the symptoms when they were babies.

According to The Sun, both girls were born with small bony lumps on their toes, a common sign of FOP — but doctors did not detect it at the time.

Officially diagnosed when they turned eight, the women said they’ve felt the side effects of the condition from a young age which can include painful swelling to an injured muscle before bones form over it.